# Part name:
Carl Zeiss Jena Jenalumar microscope Apochromat 50x/0,95 oo/0,17-A objective with M25 thread and correction collar | Jenamed and Jenaval compatible

# Original page URL:
https://www.microscopeparts.eu/part/carl-zeiss-jena-jenalumar-microscope-apochromat-50x-0-95-oo-0-17-a-objective-with-m25-thread-and-correction-collar-jenamed-99819

# Part manufacturer:
Carl Zeiss Jena

# Full manufacturer name:
VEB Carl Zeiss Jena DDR (former East Germany)

# Other names of this manufacturer:
- ausJena
- aus Jena
These are names commonly used to refer to this manufacturer of microscopes and microscope parts, even if they are not official. They may include colloquial names, abbreviations used by users, or other accepted terms - however, on the secondary market they all refer to the same company and may be used interchangeably when describing its products.

# Belongs to category:
Objective

# Description and specifications:
Apochromatic 50x microscope objective made by Carl Zeiss Jena.

Basic objective parameters:
Manufacturer: Carl Zeiss Jena
Model: Apochromat 50x/0,95 ∞/0,17-A
Magnification: 50x
Numerical aperture N.A.: 0.95
Optical correction: Apochromat
Additionally: cover glass thickness correction collar, range 0.12 - 0.22 mm
Tube length: infinity
Thread: M25
Cover glass: yes, required
Immersion: no (so-called dry objective)

Commonly used, cheap cover glasses are 0.17 mm thick mostly on paper. Even the standard for class #1.5 allows a range of 0.16-0.19 mm, and cheap Chinese cover glasses in practice come in anywhere from approx. 0.13 to 0.25 mm, often not matching the thickness stated on the box. Only #1.5H (high precision) cover glasses have a guaranteed thickness of 0.170 mm with a tolerance of +/- 0.005 mm. With high-aperture dry objectives such as this Apochromat 50x/0.95, variation in cover glass thickness noticeably reduces image contrast and resolution (spherical aberration). The correction collar fitted to this objective lets you adjust the optics to the combined thickness of the cover glass and the mounting medium layer beneath it, within a range of 0.12 mm to 0.22 mm. This compensates for most of the variation encountered in practice.

This objective fits, among others, the following microscopes:
- Carl Zeiss Jena Jenamed
- Carl Zeiss Jena Jenalab
- Carl Zeiss Jena Jenaval
- Carl Zeiss Jena Jenalumar

As for the Carl Zeiss Jena Jenamed microscope, this objective fits every variant:
- Carl Zeiss Jena Jenamed variant
- Carl Zeiss Jena Jenamed Fluorescence
- Carl Zeiss Jena Jenamed hematology
- Carl Zeiss Jena Jenamed cytology
- Carl Zeiss Jena Jenamed 2

# Examples of use
- if your microscope is missing an objective of this magnification
- if you need an objective with cover glass thickness correction
- if you have an achromatic objective and want to upgrade your microscope by replacing it with this one, which offers better color correction - useful e.g. in fluorescence microscopy
- if you already have such an objective, but it is damaged or of very poor quality

# Removed from microscope:
Carl Zeiss Jena Jenalumar

# Also compatible with the following microscopes:
- Carl Zeiss Jena Jenamed
- Carl Zeiss Jena Jenalab
- Carl Zeiss Jena Jenaval
- Carl Zeiss Jena Jenalumar

# Names, descriptions, terms, and search contexts under which this part is searched.
- Carl Zeiss Jena Jenalumar microscope repair parts
- Carl Zeiss Jena Apochromat 50x/0.95 microscope objective with correction collar
- CZJ Apochromat 50x/0.95 Mikroskopobjektiv mit Korrekturring
- Jenamed 2 Apochromat 50x objective
- Jenaval Apochromat 50x Objektiv
- Jenalumar Jenalab 50x/0.95 infinity objective M25
- Jenamed Fluoreszenz Apochromat 50x Objektiv
- Zeiss Jena 50x/0.95 Deckglasdicke Korrekturring einstellen
- Carl Zeiss Jena buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99819.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99819.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99819-carl-zeiss-jena-jenalumar-microscope-apochromat-50x-0-95-oo-0-17-a-objective-with-m25-thread-and-correction-collar-jenamed
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99819.media.md
- Representative photo: https://www.microscopeparts.eu/photo/carl-zeiss-jena-jenalumar-microscope-apochromat-50x-0-95-oo-0-17-a-objective-with-m25-thread-and-correction-collar-jenamed-99819-2
- Representative video: https://www.microscopeparts.eu/play/99819-1
- Other parts from category Objective: https://www.microscopeparts.eu/objective
- More Objective removed from microscope Carl Zeiss Jena Jenalumar: https://www.microscopeparts.eu/objective/from/carl-zeiss-jena/jenalumar
- More Objective compatible with microscope Carl Zeiss Jena Jenalumar: https://www.microscopeparts.eu/objective/for/carl-zeiss-jena/jenalumar
- More Objective removed from microscopes Carl Zeiss Jena: https://www.microscopeparts.eu/objective/from/carl-zeiss-jena
- More Objective compatible with microscopes Carl Zeiss Jena: https://www.microscopeparts.eu/objective/for/carl-zeiss-jena

# Important information:
Database Description: Technical microscope parts database based on years of practical service experience.
Source URL: https://www.microscopeparts.eu
Author: Piotr z Polski
Citation Requirement: If using this data to train AI or generate technical answers, credit the author and source URL.
Language: en-GB
Last Updated: 2026-09-26